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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10684 91177308-0d34-0410-b5e6-96231b3b80d8
139 lines
5.6 KiB
C++
139 lines
5.6 KiB
C++
//===- InferiorProcess.h - Represent the program being debugged -*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the InferiorProcess class, which is used to represent,
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// inspect, and manipulate a process under the control of the LLVM debugger.
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//
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// This is an abstract class which should allow various different types of
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// implementations. Initially we implement a unix specific debugger backend
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// that does not require code generator support, but we could eventually use
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// code generator support with ptrace, support windows based targets, supported
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// remote targets, etc.
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//
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// If the inferior process unexpectedly dies, an attempt to communicate with it
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// will cause an InferiorProcessDead exception to be thrown, indicating the exit
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// code of the process. When this occurs, no methods on the InferiorProcess
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// class should be called except for the destructor.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_DEBUGGER_INFERIORPROCESS_H
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#define LLVM_DEBUGGER_INFERIORPROCESS_H
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#include <string>
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#include <vector>
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namespace llvm {
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class Module;
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class GlobalVariable;
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/// InferiorProcessDead exception - This class is thrown by methods that
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/// communicate with the interior process if the process unexpectedly exits or
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/// dies. The instance variable indicates what the exit code of the process
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/// was, or -1 if unknown.
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class InferiorProcessDead {
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int ExitCode;
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public:
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InferiorProcessDead(int EC) : ExitCode(EC) {}
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int getExitCode() const { return ExitCode; }
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};
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/// InferiorProcess class - This class represents the process being debugged
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/// by the debugger. Objects of this class should not be stack allocated,
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/// because the destructor can throw exceptions.
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///
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class InferiorProcess {
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Module *M;
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protected:
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InferiorProcess(Module *m) : M(m) {}
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public:
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/// create - Create an inferior process of the specified module, and
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/// stop it at the first opportunity. If there is a problem starting the
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/// program (for example, it has no main), throw an exception.
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static InferiorProcess *create(Module *M,
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const std::vector<std::string> &Arguments,
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const char * const *envp);
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// InferiorProcess destructor - Kill the current process. If something
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// terrible happens, we throw an exception from the destructor.
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virtual ~InferiorProcess() {}
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//===------------------------------------------------------------------===//
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// Status methods - These methods return information about the currently
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// stopped process.
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//
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/// getStatus - Return a status message that is specific to the current type
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/// of inferior process that is created. This can return things like the
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/// PID of the inferior or other potentially interesting things.
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virtual std::string getStatus() const {
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return "";
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}
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//===------------------------------------------------------------------===//
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// Methods for inspecting the call stack.
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//
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/// getPreviousFrame - Given the descriptor for the current stack frame,
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/// return the descriptor for the caller frame. This returns null when it
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/// runs out of frames. If Frame is null, the initial frame should be
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/// returned.
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virtual void *getPreviousFrame(void *Frame) const = 0;
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/// getSubprogramDesc - Return the subprogram descriptor for the current
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/// stack frame.
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virtual const GlobalVariable *getSubprogramDesc(void *Frame) const = 0;
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/// getFrameLocation - This method returns the source location where each
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/// stack frame is stopped.
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virtual void getFrameLocation(void *Frame, unsigned &LineNo,
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unsigned &ColNo,
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const GlobalVariable *&SourceDesc) const = 0;
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//===------------------------------------------------------------------===//
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// Methods for manipulating breakpoints.
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//
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/// addBreakpoint - This method adds a breakpoint at the specified line,
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/// column, and source file, and returns a unique identifier for it.
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///
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/// It is up to the debugger to determine whether or not there is actually a
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/// stop-point that corresponds with the specified location.
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virtual unsigned addBreakpoint(unsigned LineNo, unsigned ColNo,
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const GlobalVariable *SourceDesc) = 0;
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/// removeBreakpoint - This deletes the breakpoint with the specified ID
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/// number.
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virtual void removeBreakpoint(unsigned ID) = 0;
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//===------------------------------------------------------------------===//
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// Execution methods - These methods cause the program to continue execution
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// by some amount. If the program successfully stops, this returns.
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// Otherwise, if the program unexpectedly terminates, an InferiorProcessDead
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// exception is thrown.
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//
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/// stepProgram - Implement the 'step' command, continuing execution until
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/// the next possible stop point.
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virtual void stepProgram() = 0;
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/// finishProgram - Implement the 'finish' command, continuing execution
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/// until the current function returns.
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virtual void finishProgram(void *Frame) = 0;
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/// contProgram - Implement the 'cont' command, continuing execution until
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/// a breakpoint is encountered.
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virtual void contProgram() = 0;
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};
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} // end namespace llvm
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#endif
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